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• 2008 AHR McClane & Munger Canyon Mines Page 4 <br />Effect of the Mine on the East Salt Creek Regime <br />Surface Water <br />Due to the limited disturbance of the mines there is little chance any significant effect on <br />the quantity or quality of the surface waters near either mine sites has occurred. As the <br />Division notes in its approval package for the Munger Canyon Mine, the total area that <br />will be disturbed by both mine sites amounts to 0.12 percent of the area of the East Salt <br />Creek drainage basin above the mines. <br />Surface water samples from East Salt Creek were obtained for three of four quarters <br />during the water year at monitoring stations SW-1 and SW-8. SW-4 only had flow during <br />the 1 sc and 2"d quarter. Apparently the landowner is consuming or storing all of the flow <br />between SW-8 and SW-4. The results from all water samples collected during the water <br />year are presented in Table 4. The results from the samples collected from East Salt <br />Creek above and below the mine site are generally the same for all parameters. <br />The McClane Canyon Mine discharged to East Salt Creek during four months (February, <br />March, May and June) during the water year. The water quality of the discharge met <br />discharge permit requirements with the exception that the June WET test failed. There <br />has been no discharge since that time so accelerated testing has not been initiated. <br />Table 6 contains analyses of mine water discharged into East Salt Creek. The mine <br />• water had an average TDS value of 1,801 mg/I. The average TDS value for East Salt <br />Creek at SW-1 was 1,581 mg/I during the water year. The following tables show there <br />was no degradation of East Salt Creek during the first quarter and only minor <br />degradation (0.9% increase) during the second quarter. TDS for the mine discharge is <br />the average for the quarter. The mine did not discharge during the 4t' quarter of 2007 or <br />the 3`d quarter of 2008. <br />PHC East Salt Creek First Quarter 200 8 <br /> Flow m Flow cfs TDS <br />SW-1 East Salt Creek 2,020 4.5 1972 <br />Mine Discharge 40 0.09 1962 <br /> <br />Combined Flow 2,060 4.59 1972 <br />PHC East Salt Creek Second Quarter 20 08 <br /> Flow m Flow cfs TDS <br />SW-1 East Salt Creek 1,795 4.0 1060 <br />Mine Discharge 30 0.07 1640 <br /> <br />Combined Flow 1,825 4.59 1069 <br />However the second quarter minor degradation is not apparent in the comparison of TDS <br />• values at SW-1 upstream and SW-8 downstream as shown in the following table. <br />Rev. 08/09